Upset Brief · TX-37 · Lauren Peña (R) vs. Greg Casar (D), incumbent

A long shot on the math: it takes a 58.9-point national wave.

0%
odds today
0%
odds with the plan
162,220
net votes to find
37
days left; voting starts October 19
Where
  1. 01
    Precinct 201 (Travis County)
    Starting line Casar +33. 9.7% split their ticket.
    +132
  2. 02
    Precinct 232 (Travis County)
    Starting line Casar +43. 7.3% split their ticket.
    +101
  3. 03
    Precinct 235 (Travis County)
    Starting line Casar +40. 6.6% split their ticket.
    +91
  4. 04
    Precinct 236 (Travis County)
    Starting line Casar +44. 6.4% split their ticket.
    +86
  5. 05
    Precinct 233 (Travis County)
    Starting line Casar +41. 6.0% split their ticket.
    +84
  6. 06
    Precinct 205 (Travis County)
    Starting line Casar +65. 4.9% split their ticket.
    +68

The top 12 precincts carry 17% of the plan.

How
  • P
    Persuade
    4,679 voters who split their ticket in recent elections and lean Casar today.
    +4,679
  • M
    Mobilize
    There are almost no precincts Peña's side carries, so turnout alone cannot help here.
    +0
  • C
    Consolidate
    Voters who went third party in recent races, in the precincts that lean Peña's way.
    +482

Plus a national shift of 58.9 points of margin (157,058 votes) that no campaign controls.

What has to be true
  1. Peña wins 50 percent of the ticket splitters now leaning Casar.
  2. The national environment moves about 58.9 points toward Peña's side between now and November 3.
  3. No 2026 public poll exists for this race, so the starting line is a weighted blend of official recent results; the first real poll will move it.
The numbers behind it
  • 01
    Crossover regression
    178 precincts, R² 0.964, 31 crossover precincts identified
  • 02
    Monte Carlo
    20,000 seeded simulated elections with a 7-point baseline error. 90% range of the final margin with the plan: -188,407 to -126,225 votes.
  • 03
    Money, FEC candidate totals through June 30
    Peña $770 cash on hand; Casar $597,005.
  • 04
    Call program for this list
    7,408 households, 22,224 dials, about 1,165 live conversations: an estimated $3,858 at published rates.
For the campaign

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Professional live callers on exactly these voters: persuasion, voter ID and ballot chase, with a live dashboard of every conversation. An estimated $3,858 for the full list. Days to launch.

For donors, PACs and committees

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The full plan, the map and the live odds simulator ›All Texas races ranked ›

Independent analysis by The Political Group from official Texas Secretary of State precinct returns (2022 and 2024), FEC filings and published polls, as of September 26, 2026. Not affiliated with any candidate or party.